Respirator.



Patented Feb. l2, IQI. S. GUTHRIE.

HESPIHATOR.

(Application led Muy 24, 1900.)

y(No Mludai.)

si entre t iormng part of Letters Jatent hl'o., hd'pl'vtltl, dated. February 12, .1i-lill.

Application tiled hluy 2s, i900. Serlnl No. 1:7;739. @in mantel.)

sen of the-United states, residing in the city and county ot Francisco, in the State of `Ualilornia, have invented an improvement in Respirators; and li hereby declare the following 4to be a full, clear, and exact description ci the saine. Y

invention relates to an apparatus which is especially designed for the protection of operatives nforhin in places Where they are subject to foul pases, to smoke in case of tires., and ,generally tor protection against asphyxia tion trein anyv cause.

lt consists oi pcash or protector for the nose, mouth, and eyes, means for supplying air thereto, and mechanism by which the air-supply can be brought from a distant point. l

lily invention also comprises details of con struction which will be more fully explained by reference to the accompanying drawing', in which the :hrgure is a general view of the 1whole apparatus.

An approved form of apparatus to be used tor this purpose consists of a mask or covering A, which is iitted over the mouth and nose and secured by straps or equivalent holding devices, as at The edges f this covering are drawn against the face so as to form an approximately close iii all around, and above 'thenpper part is litied the covering 3 for the eyes, having glasses 4, of any convenient form, through which the user can readily see. The eyepiece 3 as well as the mash A is fitted closely, so as to preventthe entrance of smoke or noxious gases.

For convenience the user carries about his person a lieirihle hay,r which may be strapped upon the bach or. otherwise connected. lrorn this bag an air-pipe 6 enters one side ol the Y Aniash l and an escapepipe 7 passes outpfrorn the'other side.

8 is a small branco pipe connecting with the pipe 8 and leadinginto the eyepiece 3 so 'to supply a current olifresh air about the eyes and esclude srnolre or gas thereiroruI The tlenible be his supplied throughs pipe i8 Sironi any d ant point. .es at present shown, it is connected with bellows or airiorcine mechanism, as shown 9., l have `found that two pairsof bellows suitably mounted and having.;r a iulorumed reciprocating bar l() connected with thexu and provided with a handle 11, by which it maybe oscillated, serves the desired purpose. Pipes l2 connect with each of the bellows and are provided with suitable check valves, and from these' pipes the airis forced into a couirnon main 13, which connects with. the hose 8, and thus conducts the air to the user of the mash.

la is a pressure gage which shows the amount ot pressure oi' air within the pipe.

This apparatus is useful for .firemen who are obliged to enter buildings filled with dense smoke, and the hose'roan be a sufficient length to allow them to go as far as is necesf those at the air-forcing apparatus and the wearer of the mash l have showuwhistles or equivalent soundingr devices 15 and 16, the former being connected with the conducting pipe 13 and the latter with the air-1'eceiver 5 or at some convenient point in proximity therewith,

When the wearer of the mask is desirous to communicate with those at the air-torcia g station, he does so by compressing` all supply tube 8, which produces au excess of pressure Within the pipe 13,* and this will be sufficient to open the Whistle-valve at 15 and allow the latter to be sounded. A signalcode being established, either one, two, or three signals may be given by as many cornpressions oi' thetube with an iinterval between.

if 'it is desired to communicate with the wearer oi' the mash, it is effected by means of a compressible'bag 17, which is connected with the conducting-pipe i3 and is inept full oi' air by pressure from this pipe. By suddenly compressing this bag a wave of air is forced through the pipe i3, which will be suffiicient to open the valve of the Whistle at 16, and thus communicate With the resell.` wearer.

It will be understood that the Whistle-valvesmay be controlled by springs sufficiently light to be overcome by the sudden excess of pres-v sure,but which will normally retain the valves closed under such air-pressure as is necessary to supply the operator with sufcient air for his needs. Y

Having. thus described my invention, 'what I claim as new, and desire-to secu re by Letters Patent, is- A '1.' The combination in a respirator of a Y mask or receptacle fitting over the mouth and I 'by'which air under pressure is supplied to 1 `said bag from a distant point, a pipe leading 1from the bag into the mouth and nose covering, a supplemental pipe leading from said supply-pipe to Ithe eyepiece, and an escapepipe connecting with the opposite side of the mask. l

8. vThe combination in a respirator, of a two-part 'mask fitting the mouth, nose, and

Aeyes of the wearer, an expansible bag carried upon the persone, a pipe connecting the -bag with the mouth and nose section, and a second pipe connecting with the eye-section, and meansl Vfor charging' the bag from a distant peint.

4. The combination in a. respiratory appa- 'ratus et' the face-mask, lair-supply pipe and `pressure apparatus, a whistle or sounder oon- -necting with the pipe and-located contiguous to the mask-wearer, an expansible bag connecting with the air-supply pipe contiguous to the airforcing apparatus whereby a sudden increase of pressure in thepipe in addition to that supplied by the apparatus is effected by the compression of the bag. i

In witness whereof I have hereunto set my hand..

l SAMUEL eU'rHRIE. fitnessesz Y S.- H. NoURsE,

JEssIE O. BRoDIE. 

